Partition Tab not showing in Disk Utility

Hello again everyone,
I'm attempting to partition my LaCie 2TB (RAID1) Disk in Disk Utility, however the partition tab is not showing up..
There are 4 items visible in the Disk Utility window:
1) the Internal OS Disk
2) the LaCie 2TB (RAID1) Disk
3) & 4) the two slices/partitions of the LaCie mirrored RAID
I select the 2TB LaCie RAID1 Disk, however it only shows the "First Aid" & "RAID" tabs.
The "Partition" (as well as "Erase" & "Restore") tabs are not available or shown.
When I select the Internal OS Disk all the Tabs are shown, and when the 2 slices or partitions of the RAID1 are selected it shows the "First Aid, Erase, Partition, Restore" tabs..
Am I missing a step here?? I know I'm not supposed to select the slices/partitions of the RAID, but instead to select the LaCie 2TB Disk itself, however this is the only option which does not show any "Partition" Tab..
Any assistance is GREATLY APPRECIATED.. Thank you!

Have you tried this:
Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to two. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
I'm sort of confused as to why you would partition a 3 GB drive into just a single 1 TB partition, but that's what I understood you to say. Is this 3 TB drive installed in an enclosure that actually supports a drive of that size? Older enclosures may not and should not be used.

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